tompkins



@geiten gaat@ atent @time ROBERT F. TOMPKlNS, UF NFV YORK. N. Y.

Letters Patent No. 69,510, dated Ortolml' 1, 185i'.

IMPROVEMENT 1N WOODfMITREING MACHINES.

TO ALL WHOM 1T MAY CONGERN:

Be it known that I, R. F. TOMPIHNS, of the city, county, and State of New York, have invented and useful Improvement in Machines for Cutting hIitres;H and 1 do hereby declare that the following full, clear, and exact description thereof, which will enable others skilled in the art to make and use the saine, reference being had to the accompanying drawings, forming part of this specification, in which- Figure 1 is a plan or top View of the machine.

Figure 2 an elevation or view of the machine from its front side.

Figure 3 a transverse vertical section taken in the plane of the line :t a', fig. 1, and

Figure 4 a detail view of a tool suitable for setting the machine for cutting mitres of different degrees.

Similar letters of reference indicate like parts.

The machine embraced in the present invention consists ot' two cutter or knife-blades arranged to be moved up and flown in a vertical plane, and so as to be adjusted with regard to each other at a greater or less angle in combination with rests or blocks for the material or stuft' to be out, correspondingly susceptible of adjustment, and to be brought into the proper relative positions with regard to the cutter or knife-blades.

A, in the drawings, represents a block or base, toanil in which my improved mitre-cutting machine is secured and arranged. In this block A are two similar sector-shaped rests or blocks, E. These blocks B are each hung upon a separate centre-pin, C, so as to swing or turn thereon and in the block in a horizontal plane, the upper surface of the two blocks being ilush and even withthe upper surface of the block in which they are hung. D, set or thumb-screws, one to each rest-blocli B, into'which they screw, passing through a cireular- Shaped slot, E, in a stationary board or plate, F, scoured to the main block A over the position of the rest-blocks B. The centre of each circular slot E is at the centre-pin to the rest-blocks, and by the set or thumb-screws Dthe said blocks can be thus secured'in any position to which they may be swung or brought with reference to each other, and within the limit ot' the length to the slots E. H ll, uprights or posts secured to upper side of plate F, with their edges I parallel to each other, and angular shaped in erosssection. Between the edges I, to the post H, a plate, K, is arranged to nieve up and down or in a vertical plane. L, a lever-handle hung to plate K, for operating the same between its guide-posts. To the plate K two wing-pieces M are hinged, so as -to swing around thereon in a circular direction, the eeutrenpin ot' each wing M being in corresponding vertical planes to the centre-pins to the rest-blocks belen. 'l'o cach wing alinife or cutter-blade, N, is fastened in a vertical position, each cutter-blade having its lower edge sharpened, and inclined or angular in direction to the length of the blade. l), thumb or set-screws .screwing into the wing-pieces M, one to each of the same, passing through circular slots Q, concentric with the wing-centros of fixed plate Q2. "hose thumb-screws enable thc wing-pieces to be secured in any position to which they may and can be adjusted. R, strips secured to front tide of. posts l-l by means of thumb-screws S passingwthrough slots ot` the posts, so that they can be adjusted to bring their inner ends T nearer to or further freni cach other. These strips R act as guides to the stu or material to he cut in the machine. i

ln the use of the machine above described, iirst loosen the set-screws to the cutter-carrying arms and the rest-block, -when, by means of the instrument shown in iig. fi, bring the two cutter-blades to the desired angle or direction apart, where secure thorn by their' set-screws. New bring the rest-blocks to a .corresponding angular position with the knife or cutter-blocks, and so that the side T to such blocks will form guides to the cutting edge of the blades in their downward movement, which being done, there secure them by tightening their set or thumb-screws, and the machine is then ready for cutting, for which purpose the critterblades are raised by properly lifting the handle-lever, when, sliding the stuii` along to the position of the cutters over and upon the blocks B, bring down the knife-blades thereon, each of which will cut through the stuit in an angular direction to its length, and, of course, corresponding to the angular direction in which they were previously adjusted. To enable the rest-blocks to be the more readily adjusted in position to the knife-blades, 1 provide each one with an upright common guidepioce U. V, an upright grooved post at the angle to the cutter-blades N. This post is arranged to be moved or adjusted in position either more or less in or out, being operated through a thumb-screw, W, properly applied thereto.

I claim as new, and desire to secure by Letters Patent-H 1. The adjustable sector-shaped rest-blocks B, having guide-pieces U, in combination with the guide-wing M, adjusted by means of the set-screws P in tll'e slotted plate F and bearing the in-olined cutter-blades N, and with the adjustable guide-strips R, substantially as described for the 'purpose speciiied. v l

2. The adjustable grooved post V, in combination with tbe cutter-blades N and rest-blocks B, as and for the purpose speoied.

The above specification of my irivention signed by me this 22d day of April, 1867.

i ROBT. F. TOMPKINS.

Witnesses:

WM. F. McNAMARA, ALBERT W. BRowN. 

